Lens assembly, I opened one for the photo, p/n 05517-60305-xxx where xxx is a serial number, very well made and AR coated, can be disassembled. The one you get will be sealed. I believe this is used with a helium-neon laser.

Lens assembly, I opened one for the photo, p/n 05517-60305-xxx where xxx is a serial number, very well made and AR coated, can be disassembled. The one you get will be sealed. I believe this is used with a helium-neon laser.